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X9258 Datasheet(PDF) 9 Page - Xicor Inc. |
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X9258 Datasheet(HTML) 9 Page - Xicor Inc. |
9 / 22 page X9258 Characteristics subject to change without notice. 9 of 22 REV 1.1.7 2/4/03 www.xicor.com REGISTER DESCRIPTIONS Data Registers, (8-Bit), Nonvolatile Four 8-bit Data Registers for each DCP. (sixteen 8-bit registers in total). – {D7~D0}: These bits are for general purpose not volatile data storage or for storage of up to four different wiper values. The contents of Data Register 0 are automatically moved to the wiper counter register on power-up. Wiper Counter Register, (8-Bit), Volatile One 8-bit Wiper Counter Register for each DCP. (Four 8-bit registers in total.) – {D7~D0}: These bits specify the wiper position of the respective DCP. The Wiper Counter Register is loaded on power-up by the value in Data Register 0. The contents of the WCR can be loaded from any of the other Data Register or directly. The contents of the WCR can be saved in a DR. WP7 WP6 WP5 WP4 WP3 WP2 WP1 WP0 NV NV NV NV NV NV NV NV (MSB) (LSB) WP7 WP6 WP5 WP4 WP3 WP2 WP1 WP0 V VVVVVV V (MSB) (LSB) Instruction Format Notes: (1) “MACK”/”SACK”: stands for the acknowledge sent by the master/slave. (2) “A3 ~ A0”: stands for the device addresses sent by the master. (3) “X”: indicates that it is a “0” for testing purpose but physically it is a “don’t care” condition. (4) “I”: stands for the increment operation, SDA held high during active SCL phase (high). (5) “D”: stands for the decrement operation, SDA held low during active SCL phase (high). Read Wiper Counter Register (WCR) Write Wiper Counter Register (WCR) Read Data Register (DR) S T A R T device type identifier device addresses S A C K instruction opcode WCR addresses S A C K wiper position (sent by slave on SDA) M A C K S T O P 0101 A 3 A 2 A 1 A 0 100100 P 1 P 0 W P 7 W P 6 W P 5 W P 4 W P 3 W P 2 W P 1 W P 0 S T A R T device type identifier device addresses S A C K instruction opcode WCR addresses S A C K Data Byte (sent by master on SDA) S A C K S T O P 0101 A 3 A 2 A 1 A 0 101000 P 1 P 0 W P 7 W P 6 W P 5 W P 4 W P 3 W P 2 W P 1 W P 0 S T A R T device type identifier device addresses S A C K instruction opcode DR and WCR addresses S A C K Data Byte (sent by slave on SDA) M A C K S T O P 0101 A 3 A 2 A 1 A 0 1011 R 1 R 0 P 1 P 0 W P 7 W P 6 W P 5 W P 4 W P 3 W P 2 W P 1 W P 0 |
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